using 400 and 600 sand paper, that rough for processor
i prefer 1000 or more that looks safer

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It really depends on the scratches you're trying to remove. if you have a huge, deep scratch you'll lose an arm trying to sand it out. I've started with 80 grit on heatsinks before because they were so bad to start with.

It get's real dry here in the winter months...so when I put a rig together in the winter I always remove my socks and wet my hair. Works like a charm. And motherbaords always sit on the anti-static bags they came in until the get installed - humid or not.

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just so you know an anti static bag protects its innards from harm by allowing the electricity to ride along the outside of the bag......puting your mobo on it is no different than putting it on tin-foil